Enumerate the meaning, procedure and essence of mechanistic and mechanistic emperical approach for analysis and design of flexible pavement

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Which of the following refers to refers to how well the control system responds to sudden changes in the system. a)-transient regulation b)- distributed regulation c)-constant regulation d)-steady-state regulation

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.